A greywater system collects lightly contaminated wastewater from baths, showers and basins, treats it and stores it for reuse in non-potable applications such as toilet flushing, washing machine supply and garden irrigation. UK installations follow BS 8525-1 and Building Regulations Part G, which set out water quality and dual pipe identification requirements. Treatment usually combines filtration, biological breakdown and disinfection to reduce bacteria and odour. Greywater systems can significantly reduce mains water demand, which is particularly relevant in southeast England, classified as seriously water stressed. They are increasingly specified in new build residential schemes across Greater London to support sustainability targets. Regular servicing is essential to keep filters clear, top up disinfection and maintain water quality.
Greywater system
System collecting wastewater from baths and basins for reuse in toilet flushing or irrigation.
